Hydron rhymes with:
audran, cauldron, chadron, children, condron, excedrin, gendron, grandchildren, hendron, kindran, madron, octahedron, padron, philodendron, polyhedron, ravindran, rhododendron, schoolchildren, squadron, stepchildren, tetrahedron, vorndran, waldren, waldron
Hydron sounds like:
hadrian, hathorn, hathorne, hawthorn, hawthorne, headroom, heidorn